Feel free to adopt. I also want to add that I know there is nothing in the show that even implies this.
Any Place But Home
Sam cutting. Danny catches her at it one night when he stops in to check on her before going home after a patrol. He checks regularly, and mostly she's sleeping. Sometimes on her computer. Once doing that with her little vibrating friend (he split fast that night and could barely look her in the eyes for a week). Sometimes he stops by because she asked him to, or he hits her house before patrols. For help with homework. To talk. Whatever
After the masturbation invasion: and never mind that he had to go home and spend an hour under cold water after that, or that he hadn't slept at all for days because wondering who she had fantasized about made him sick to his stomach.
Sam cuts because she's lost control of the rest of her life. Her mother… has bowed before a sick, abusive, alcoholic husband. A husband who can't stand her, or their daughter. And Sam is on the brunt because she's the kind of girl who's in your face about who she is. She isn't going to change for anyone or anything. (Which is why she loves Danny so, he never tries to change her.) Her father calls her ungrateful, a disgrace (despite her prefect grades), a whore, a slut, a liar. Things like that.
Sam refuses to tell Danny why she does it, just kind of wilts under his anger. Danny finds out the hard way—her father blows a gasket while Danny is over. It's school related, and her father isn't supposed ot be home. He's supposed to be in Japan till the end of the month, but he comes home early for some reason. Confrontation. Dad gets pissy with Sam, calls her names and takes a smack at her in front of Danny. Who reacts as you can imagine a lovesick boy is going to do when his lady is injured.
But that's the only place Sam isn't more than strong. She's great with everything else. Ghost fighting, school. Her protests. That's why no one knew about it for so long. That, and because her daddy is a good actor.
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AN: It's a pain in the butt to upload here, and I'm more active on AO3 anyway, so I'm going to start warning here. Within the next 10 chapters I will only be posting new things on AO3, please feel free to go check new things out over there. I have currently 100+ things looking to be posted, hopefully it will be worth your time. My AO3 is linked in my profile, or you can search me there under chaosdragon, plotqueen, or allbodypartsforsale.